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# Chrome Launcher [](https://github.com/GoogleChrome/chrome-launcher/actions) [](https://npmjs.org/package/chrome-launcher)
<img src="https://user-images.githubusercontent.com/39191/29847271-a7ba82f8-8ccf-11e7-8d54-eb88fdf0b6d0.png" align=right height=200>
Launch Google Chrome with ease from node.
* [Disables many Chrome services](https://github.com/GoogleChrome/chrome-launcher/blob/main/src/flags.ts) that add noise to automated scenarios
* Opens up the browser's `remote-debugging-port` on an available port
* Automagically locates a Chrome binary to launch
* Uses a fresh Chrome profile for each launch, and cleans itself up on `kill()`
* Binds `Ctrl-C` (by default) to terminate the Chrome process
* Exposes a small set of [options](#api) for configurability over these details
Once launched, interacting with the browser must be done over the [devtools protocol](https://chromedevtools.github.io/devtools-protocol/), typically via [chrome-remote-interface](https://github.com/cyrus-and/chrome-remote-interface/). For many cases [Puppeteer](https://github.com/GoogleChrome/puppeteer) is recommended, though it has its own chrome launching mechanism.
### Installing
```sh
yarn add chrome-launcher
# or with npm:
npm install chrome-launcher
```
## API
### `.launch([opts])`
#### Launch options
```js
{
// (optional) remote debugging port number to use. If provided port is already busy, launch() will reject
// Default: an available port is autoselected
port: number;
// (optional) Additional flags to pass to Chrome, for example: ['--headless', '--disable-gpu']
// See: https://github.com/GoogleChrome/chrome-launcher/blob/main/docs/chrome-flags-for-tools.md
// Do note, many flags are set by default: https://github.com/GoogleChrome/chrome-launcher/blob/main/src/flags.ts
chromeFlags: Array<string>;
// (optional) Additional preferences to be set in Chrome, for example: {'download.default_directory': __dirname}
// See: https://chromium.googlesource.com/chromium/src/+/main/chrome/common/pref_names.cc
// Do note, if you set preferences when using your default profile it will overwrite these
prefs: {[key: string]: Object};
// (optional) Close the Chrome process on `Ctrl-C`
// Default: true
handleSIGINT: boolean;
// (optional) Explicit path of intended Chrome binary
// * If this `chromePath` option is defined, it will be used.
// * Otherwise, the `CHROME_PATH` env variable will be used if set. (`LIGHTHOUSE_CHROMIUM_PATH` is deprecated)
// * Otherwise, a detected Chrome Canary will be used if found
// * Otherwise, a detected Chrome (stable) will be used
chromePath: string;
// (optional) Chrome profile path to use, if set to `false` then the default profile will be used.
// By default, a fresh Chrome profile will be created
userDataDir: string | boolean;
// (optional) Starting URL to open the browser with
// Default: `about:blank`
startingUrl: string;
// (optional) Logging level
// Default: 'silent'
logLevel: 'verbose'|'info'|'error'|'silent';
// (optional) Flags specific in [flags.ts](src/flags.ts) will not be included.
// Typically used with the defaultFlags() method and chromeFlags option.
// Default: false
ignoreDefaultFlags: boolean;
// (optional) Interval in ms, which defines how often launcher checks browser port to be ready.
// Default: 500
connectionPollInterval: number;
// (optional) A number of retries, before browser launch considered unsuccessful.
// Default: 50
maxConnectionRetries: number;
// (optional) A dict of environmental key value pairs to pass to the spawned chrome process.
envVars: {[key: string]: string};
};
```
#### Launched chrome interface
#### `.launch().then(chrome => ...`
```js
// The remote debugging port exposed by the launched chrome
chrome.port: number;
// Method to kill Chrome (and cleanup the profile folder)
chrome.kill: () => Promise<void>;
// The process id
chrome.pid: number;
// The childProcess object for the launched Chrome
chrome.process: childProcess
```
### `ChromeLauncher.Launcher.defaultFlags()`
Returns an `Array<string>` of the default [flags](docs/chrome-flags-for-tools.md) Chrome is launched with. Typically used along with the `ignoreDefaultFlags` and `chromeFlags` options.
Note: This array will exclude the following flags: `--remote-debugging-port` `--disable-setuid-sandbox` `--user-data-dir`.
### `ChromeLauncher.Launcher.getInstallations()`
Returns an `Array<string>` of paths to available Chrome installations. When `chromePath` is not provided to `.launch()`, the first installation returned from this method is used instead.
Note: This method performs synchronous I/O operations.
### `.killAll()`
Attempts to kill all Chrome instances created with [`.launch([opts])`](#launchopts). Returns a Promise that resolves to an array of errors that occurred while killing instances. If all instances were killed successfully, the array will be empty.
```js
const ChromeLauncher = require('chrome-launcher');
async function cleanup() {
await ChromeLauncher.killAll();
}
```
## Examples
#### Launching chrome:
```js
const ChromeLauncher = require('chrome-launcher');
ChromeLauncher.launch({
startingUrl: 'https://google.com'
}).then(chrome => {
console.log(`Chrome debugging port running on ${chrome.port}`);
});
```
#### Launching headless chrome:
```js
const ChromeLauncher = require('chrome-launcher');
ChromeLauncher.launch({
startingUrl: 'https://google.com',
chromeFlags: ['--headless', '--disable-gpu']
}).then(chrome => {
console.log(`Chrome debugging port running on ${chrome.port}`);
});
```
#### Launching with support for extensions and audio:
```js
const ChromeLauncher = require('chrome-launcher');
const newFlags = ChromeLauncher.Launcher.defaultFlags().filter(flag => flag !== '--disable-extensions' && flag !== '--mute-audio');
ChromeLauncher.launch({
ignoreDefaultFlags: true,
chromeFlags: newFlags,
}).then(chrome => { ... });
```
### Continuous Integration
In a CI environment like Travis, Chrome may not be installed. If you want to use `chrome-launcher`, Travis can [install Chrome at run time with an addon](https://docs.travis-ci.com/user/chrome). Alternatively, you can also install Chrome using the [`download-chrome.sh`](https://raw.githubusercontent.com/GoogleChrome/chrome-launcher/v0.8.0/scripts/download-chrome.sh) script.
Then in `.travis.yml`, use it like so:
```yaml
language: node_js
install:
- yarn install
before_script:
- export DISPLAY=:99.0
- export CHROME_PATH="$(pwd)/chrome-linux/chrome"
- sh -e /etc/init.d/xvfb start
- sleep 3 # wait for xvfb to boot
addons:
chrome: stable
```
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